Modulated B-

Output function to operate a component.

The idle valve motor is operated by the control module through internal activation of the transistor which provides a ground for the open winding of the valve.

The idle control valve is operated by regulation of the duty cycle at a specific frequency.

Fig 1: Identifying Output Function To Operate Component (Modulated B-)

Courtesy of BMW OF NORTH AMERICA, INC.

Typical Application of modulated B- 

• Idle Control Motor.
• Purge Valve.
• Injector.
• Ignition Coil.